I know it will sound a stupid question, but how do you factory reset the 3650? I tried the *#7370#, it tells me it will reset and the phone will restart, then asks me the lock code, which I enter. Then nothing. I waited over two hours and it sits there. The power button seems to be functioning no more, but if I take the battery out, put it back and turn on the power, the date is reset, but that's it. The contacts, settings (like GPRS, BT paired devices) are all there.

If any error showing on the phone boot-up, please have the memory card formatted and by next phone
start-up you will not have the error msg again.

If you some important data or programs files on your MMC card, please use
a card reader to have them copied onto a pc before performing memory card
formatting

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Basically, the abc trick, i think, means that when your phone doesn't start up
anymore because of a system error, you keep the abc button pressed, and it will
start up...
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type *#7370# and enter security code (standart 12345).
Make sure the phone is charged or pluged in and don't remove the cell.
The format will take several minutes.

My phone manual showed a routine where you choose a return to default by the menus with no need to press codes. Is you phone able to use the icons or too messed up? Nokia phones like the 3650 and other symbian phones are junk in my opinon. The lack of stability and difficulity of using bluetooth to transfer data is worth it. Future phones should be more stable but testing the phones on the public is really hurting their market share and reputation.

ps don't rule out getting rid of the phone and starting over with someting like the superior motorola v300 - just get the data kit. Better quality/price and rock solid.
The whole nokia symbian OS thing has been a disaster for nokia. Same with bluetooth - have you noticed how few other manufactures are adopting either standard? The bulk of the phones being sold are non BT and non symbian os.

Why would you send the phone to Nokia? They officially deny there are any problems like yours or mine except to say they never heard of it or that it must be the battery is bad or loose or they simply have nothing to say. The product has inherient defects that firmware update /software will NOT solve.